Giant Sleeper Shark

A giant sleeper shark filmed off the coast of Japan.

Giant Sleeper Shark is a species of sleeper shark and also the largest of the sleeper sharks and one of the largest sharks alive today, growing up to an average length of about 20.3 metres (67 ft) and weighing about 61.3 metric tons (69.3 short tons), being about the size of an extinct Miocene and Pliocene Megalodon, but rarely grows to about 23.7 metres (74 ft) and weighing 68.3 metric tons (76.3 short tons). They also fill a niche similar to the Megalodon, although mostly restricted to the deep dark waters where Megalodons didn't lived in, so giant sleeper sharks feed mainly on giant squid, colossal squid, smaller sharks, large crustaceans, and carcasses of other sea animals (and sometimes even land animal carcasses). Fortunately, it is sluggish, nonaggressive, and slow-moving, making it relatively not threatening to any land species, since it lives in the deep and cold waters so it doesn't need to be active or aggressive. They also tolerate high amounts of pollution, acidity, temperature changes, and brightness. This species of sleeper shark has been around since the Eocene around 46.9 million years ago as fossil finds suggests. Giant sleeper sharks are one of the oldest natural vertebrates on Earth, living in the ripe old age of 1,950 years, almost more than three times as much as a Greenland shark's lifespan. Despite their size or long lifespan, not every giant sleeper sharks reach the size of a Megalodon or more nor live past 100, as they do have natural predators such as killer whales. They are listed as least concern as giant sleeper sharks have no signs of populations being threatened in any ways.
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